石灰改性磷石膏水泥砂浆耐久性能研究

Study on durability of lime modified phosphogypsum cement mortar

将生石灰对磷石膏进行陈化预处理,研究不同掺量生石灰对磷石膏水泥砂浆耐久性能的影响。结果表明,适量生石灰加入磷石膏水泥砂浆能改善其耐久性。生石灰的掺加会抑制磷石膏水泥砂浆抗冻性,磷石膏水泥砂浆的质量损失率和抗压强度损失率随生石灰掺入量的增多而变大;随着生石灰掺入量增加,磷石膏水泥砂浆的抗渗性和抗硫酸盐腐蚀性能先增大后减小,当生石灰掺入量为2%时,磷石膏水泥砂浆抗渗性及抗硫酸盐腐蚀性最好。

The effect of different dosage of quicklime on the durability of phosphogypsum cement mortar was studied.The results show that the durability of phosphogypsum cement mortar can be improved by adding appropriate amount of quicklime.The results show that the addition of quicklime will inhibit the frost resistance of phosphogypsum cement mortar,and the mass loss rate and compressive strength loss rate of phosphogypsum cement mortar increase with the increase of quicklime content;with the increase of quicklime content,the impermeability and sulfate corrosion resistance of phosphogypsum cement mortar increase first and then decrease;when the content of quicklime is 2%,the impermeability and sulfate corrosion resistance of phosphogypsum cement mortar is the best.